Unlock instant, AI-driven research and patent intelligence for your innovation.

Ignition system

a technology of ignition system and resistor, which is applied in the direction of spark gap circuit, machine/engine, mechanical apparatus, etc., can solve the problems of resistor deterioration, wear on the discharge surface, and change of resistance, so as to improve the life of the ignition plug

Active Publication Date: 2015-12-24
DENSO CORP
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent is about an ignition system that can increase the life of its ignition plug. The system achieves this by reducing the required voltage to decrease capacitance discharge current.

Problems solved by technology

The discharge spark is repeatedly generated between the center electrode and the ground electrode, which causes wear on the discharge surfaces and the like.
However, actually there is manufacturing difficulty involved in filling the space with the resistor at a density which enables sufficient effect of reducing the capacitive discharge current to be obtained as described above.
However, in this case, the resistor might deteriorate because of heat stress received from combustion in the combustion chamber, which changes the resistance.
As a result, it has been difficult to secure ignitability and reduce the capacitive discharge current, and it has not been possible to improve the lifetime of the ignition plug.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Ignition system
  • Ignition system
  • Ignition system

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0022]With reference to FIGS. 1 to 5, a first embodiment of the ignition system is described.

[0023]The ignition system 1 of this embodiment has an ignition coil unit 5, an ignition plug 2 and a voltage limiter 3, as shown in FIG. 1.

[0024]The ignition coil unit 5 has a primary coil 51 and a secondary coil 52 which are magnetically coupled with each other.

[0025]The ignition plug 2 has a first electrode (center electrode) 21 and a second electrode (ground electrode) 22, and generates discharge spark between the electrodes 21 and 22 by applying voltage between them on the basis of the magnetic energy accumulated in the ignition coil unit 5.

[0026]The voltage limiter 3 limits the voltage Vs applied between the center electrode 21 and ground electrode 22 by supplying electric energy from the ignition coil unit 5 such that the absolute value of the voltage Vs does not exceed a predetermined voltage limit value VL. As shown in FIG. 4, the voltage limiter 3 changes the voltage limit value VL ...

second embodiment

[0056]This embodiment, as shown in FIG. 6, is an example of the ignition system 1 having the high tension cable (connection wire 11) with a built-in voltage limiter 3. The voltage limiter 3 is provided in the rod portion 111 of the connection cable 11.

[0057]In this embodiment, the voltage limiter 3 has a first terminal on the ground side and a second terminal on the connection wire side, and the first terminal is connected to a housing 24 of the ignition plug 2. The second terminal of the voltage limiter 3 is electrically connected to the connection wire 11 in the rod portion 111.

[0058]Other configurations are the same as the first embodiment. It will be noted that, of the symbols used in the description and the drawing of this embodiment, the same symbols are used for the same elements as the first embodiment unless otherwise noted.

[0059]In this embodiment, providing the voltage limiter 3 in the rod portion 111 can improve workability for attaching the ignition system 1 to the inte...

third embodiment

[0060]This embodiment is an example where the switching element 31 is closer to the terminal on the connection wire 11 side than the voltage regulating element 32 is, as shown in FIG. 7.

[0061]That is, in each series unit, the switching element 31 is connected at a position closer to the ignition coil 5 than a position where the voltage regulating element 32 is connected is. In this case, if a MOSFET or an IGBT is used as the switching element, high voltage is applied to the base terminal, which might damage a controller such as an engine ECU which is connected to the base terminal. Accordingly, in this embodiment, for example, there may be used as the switching element 31 a photo coupler which can transmit electrical signals with the controller electrically insulated from the connection wire 11 by converting the electrical signals to optical signals.

[0062]Otherwise this embodiment has the same configurations and effects as the first embodiment. It will be noted that, of the symbols ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An aspect according to this disclosure provides an ignition system having an ignition coil unit, an ignition plug and a voltage limiter. The ignition coil unit has a primary coil and a secondary coil which are magnetically coupled with each other. The ignition plug has a center electrode and a ground electrode, and generates discharge spark between the center and ground electrodes to which voltage is applied on the basis of the magnetic energy accumulated in the ignition coil unit. The voltage limiter limits an absolute value of the voltage applied to the electrodes of the ignition plug to a voltage limit value, the voltage limiter increasing the voltage limit value as cumulative usage time of the ignition plug increases, the applied voltage being caused by electrical energy supplied from the ignition coil.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is based on and claims the benefit of priority from earlier Japanese Patent Application No. 2014-128326 filed on Jun. 23, 2014, the description of which is incorporated herein by reference.BACKGROUND[0002]1. Technical Field[0003]This disclosure relates to an ignition system having an ignition plug.[0004]2. Related Art[0005]Ignition plugs used as ignition means in a combustion chamber of an internal combustion engine are configured to ignite air-fuel mixture by generating discharge spark at spark discharge gaps between center electrodes and the ground electrodes. The discharge spark is repeatedly generated between the center electrode and the ground electrode, which causes wear on the discharge surfaces and the like. Accordingly, the ignition plug deteriorates, depending on the cumulative usage time.[0006]In an initial stage of spark discharge, charge accumulated in stray capacitance between the center electrode and the sur...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): H01T15/00
CPCF02P13/00H01T15/00
Inventor DEGUCHI, MASATAKA
Owner DENSO CORP